3. Make a budget and stick to it.

As unexciting as it sounds, budgeting in both your business and your personal life is essential to becoming a millionaire. In the book The Millionaire Next Door, authors Thomas Stanley and William Danko discovered that self-made millionaires diligently tend to the ebb and flow of their bank accounts. No matter how wealthy they become, that behavior doesn’t change -- which is why they stay wealthy.